Apparatus and Method for Calibrating Audio-Visual Signal

a technology for audio-visual signals and apparatuses, applied in the field of apparatuses for calibrating audio-visual signals and the field thereof, can solve problems such as unsatisfactory calibrating effects

Active Publication Date: 2012-08-30
XUESHAN TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]According to an embodiment of the present invention, an apparatus for calibrating an AV signal comprises a controller, for generating a control signal; a controlled filter, for selectively filtering the AV signal in response to the control signal to output either the AV signal or a filtered AV signal; and a calibrator, for generating a group of calibrating coefficients according to the filtered AV signal and calibrating the AV signal according to the group of calibrating coefficients.

Problems solved by technology

However, with respect to signals within two different frequency bands, the foregoing conventional structure of calibrator and calibrating method only perform identical calibration based on the down-converted mixed signals, fails in specifically calibrating the video signal or the audio signal, and thus creates an un-ideal calibrating effect.

Method used

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Embodiment Construction

[0019]The following description and figures are disclosed to gain a better understanding of the advantages of the present invention, and identical components in the various figures are marked with identical reference symbols. FIG. 2 is a block diagram of a wireless receiver in accordance with an embodiment of the present invention. A wireless receiver 20 comprises an RF receiver 21, a zero-IF direct down converter 22, an I / Q imbalance calibrator 23, and a baseband demodulator 24, a controllable filter 26, and a controller 28.

[0020]More specifically, the wireless receiver 20 receives an RF AV signal via the RF receiver 21, and the RF AV signal comprises an RF video signal and an RF audio signal having different frequency bands and different RF central frequencies.

[0021]The received RF AV signal is down-converted via the zero-IF direct down converter 22 to a baseband AV signal that comprises a baseband video signal and a baseband audio signal. The zero-IF direct down converter 22 comp...

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Abstract

An apparatus for calibrating an audio-visual (AV) signal includes a controller for generating a control signal, a controllable filter for selectively filtering the AV signal in response to the control signal to output either the AV signal or a filtered AV signal; and a calibrator for generating a group of calibrating coefficients according to the filtered AV signal and calibrating the AV signal according to the group of calibrating coefficients.

Description

CROSS REFERENCE TO RELATED PATENT APPLICATION[0001]This patent application is based on Taiwan, R.O.C. patent application No. 100106374 filed on Feb. 25, 2011.FIELD OF THE INVENTION[0002]The present invention relates to an apparatus for calibrating an audio-visual (AV) signal and method thereof, and more particularly, to an apparatus for calibrating a baseband AV signal applied to an analog television (TV) system and method thereof.BACKGROUND OF THE INVENTION[0003]FIG. 1.1 is a block diagram of a wireless receiver for receiving an analog AV signal in the prior art. A wireless receiver 10 comprises a radio frequency (RF) receiver 11, a zero intermediate frequency (zero-IF) direct down converter 12, an In-phase / Quadrature (I / Q) imbalance calibrator 13, and a baseband demodulator 14. The RF receiver 11 receives an RF AV signal that comprises an RF video signal and an RF audio signal. The RF video signal and the RF audio signal are applied to an analog TV system, and are respectively wit...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N17/00
CPCH04N17/00
Inventor YANG, WEN CHIEHLAN, CHING FUWANG, JEN HSINGLAI, YI HSUANHO, CHIN FUKUO, HSIN CHUANCHENG, YOU-TSAITUNG, TAI LAI
Owner XUESHAN TECH INC
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